1. any black variety of nut
2. testicles on a negro (especially very large ones)
3. part of a phrase of inquiry into a black man's sanity

1. WTF is with these dark walnuts? I never ordered any nigger nuts!
2. If Mike Tyson ever tried to rape me, I'd kick him so hard in his nigger nuts he'd change his mind fast!
3. Chris Rock is dating Roseanne Barr? Is that nigger nuts?